A former New Orleans police officer is under investigation for shooting Henry Glover outside an Algiers strip mall four days after Hurricane Katrina, the first act in a bizarre chain of events that has led to a massive federal probe into the city’s Police Department. Over the past year, the U.S. Department of Justice has interviewed scores of officers in an effort to determine how the 31-year-old Glover died, as well as whether officers may have tried to cover up his death.